have a question about my cell phone and volume.i have a kenwood hu 4v pre. ws420.i plug my phone into the hu..my phone has a volume and when you first plug it in it plays at vol 11. i always turn my phone to the max vol of 15 .should i leave my phone at 11 and tune off of that or turn phone all the way up and tune from there.

Always tune to the maximum volume you can achieve upstream without distortion. In other words, turn all the gains downstream to minimum and crank up your phone until you hear distortion. If it doesn't distort at maximum volume, then tune at maximum volume. Then just turn up gains going downstream, always staying just a notch below distortion. Do it this way and you'll reduce the chance of blowing things up.